> For the complete documentation index, see [llms.txt](https://alham-rizvi.gitbook.io/alhamrizvi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://alham-rizvi.gitbook.io/alhamrizvi/picoctf-writeups/picoctf/forensics/pcap/eavesdrop.md).

# eavesdrop

#### **The Goal**

Extract and decrypt a hidden file transferred over a specific TCP stream in a network capture (`.pcap`) file.

#### **The Process**

1. **Locate the Traffic:** Open the PCAP in Wireshark and filter for traffic on **Port 2009**. Follow the **TCP Stream** to see the conversation.
2. **Identify the Data:** Look for a packet containing a large block of data. You’ll know you have the right part if the raw data starts with the ASCII characters **`Salted__`**.
3. **Extract the File (Crucial Step):** \* Do **not** copy-paste the text manually (this often corrupts the binary formatting).
   * In Wireshark, change the view from "ASCII" to **"Raw"**.
   * Click **"Save as..."** to export the raw bytes directly as a file (e.g., `data.des3`).
   * *Alternative:* Use [HexEd.it](https://hexed.it/) to paste the hex and export it as a binary file to ensure no data is lost.
4. **Run the Command:** Execute the decryption command provided in the challenge hint while in the same folder as your saved file.


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